Measured-service telephone system.



B. D. WILLIS.

MEASURED SERVICE TELEPHONE SYSTEM.

APPLICATION FILED NOV. 22. ISIII. 1,244,816. Patented Oct. 30,1917.

3 SHEETS-SHEET I.

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B. 0, WILLIS. MEASURED SERVICE TELEPHONE SYSTEM.

APPLICATION HLED NOV. 22,1911.

1,244,816. Patented Oct. 30,1917.

3 SHEETS-SHEET 2.,

. Q l l lll llH TTOR/VEYS.

B. 0. WILLIS.

MEASURED SERVICE TELEPHONE SYSTEM.

APPLICATION FILED NOV. 22. 19M.

3 SHEETS-SHEET 3.

Patented Oct. 30,1917.

BERNARD n'wrLL'is, ororrrcnsopirrrivois; assienon y ro stamina nnnc'rnio corirnnr, or 'onIoAeo, i rnvors, is oonromirlonfon ILLINOIS.

To all w/wm itmaycomern: I

Be it known that I, BERNARD D. VVnJLIs, a citizen of the UnitedStates of-America, and residentof Chicago, Cook'county, Illinois, have invented a certain new and 'usefulflm provement in Measured-Service Telephone Systems, ofwhich' the following is a specifiti j My invention relates to an improved meas ured' service telephone system, and relates more particularly to an improved coin-col lecting device and the method of operating the same in connectionwith an automatic telephone system; v i i It relates to atelephone system in which a "connection is automatically established betweena calling and acalledsubscriberby means of suitable automatic switches,-and in which it is necessary for the calling subscriber to deposit a coin in'the coin-collectf ing device before he can carry on a conversation with the called subscriber. g Heretofore, in systems of this general type, it'has been customary to provide means whereby when the called subscriber answered he could be heard by the calling subscriber; but the calling subscriber could not converse with the called subscriberuntil after he had deposited a coin in the coin-collectingdevicia. In such systems, when the calling subscriber heard the called subscriber answer,v it n was a signal for him to deposit acoin, whiclr coin operated to rend-erhis telephone operative. for conversational purposes. Such systems, however, have been found objectionable owing to the fact that a certain amountof time elapsed between the answeringof the called subscriber and the time when thelcoin' deposited by thecalling subscriber rendered; the system operative, so that the calling subscriber couldrtalk' to the called subscriber. During this interval of time. the called subscriber was unable to hear the'calling subscriber, and it has, therefore, been found that oftentimes the called subscriber would hang, up his receiver before the calling subscriber had deposited a coin, thinking that he had been called by mistake. In order to obviate thisdiflicultyI have provided a system in which the coin can be partially inserted withinthe coin c'ollecting device prior to the response of the called subscriber. The re sponse 'ofthe called subscriber renders the calling subscribers receiver and transmitter inoperative, but atthe same time the coin MFA BE $E W E P O E i m-n i e bf Lettcrsl etentn Oct. Application filed November 22,1911; seriaiiveec1je4;

' called substation is releasedandallowed to pass intothelc'oincollecting deviceat which time the coin operates-to again render the calling transmitt'er "andreceiver operative for conversa tional purposes; T In this manner there is no appreciablev delay between the g-response of the called subscriber and the time when the coin renders the calling 'subscriberfstelephone operative. If; however,"=n'o. coinis deposited, the response of the called subscr ber having rendered the calling subscrlbers transmitter and receiver inopera tive, it is impossible for a conversation to be carried on. my improved system the coin can be partially depositedany time prior to theresponse or" the called 'subscriber, but=it is not necessary to deposit this coin before" I the'calling device is operated to operate the automatic switches, as this callingoevice of the, coin-controlled mechanism, i I have chosen to illustrate myinventionin connection with an automatic system of the well-known type comprising line switches, which are individual; to the calling sill) scribers line, first and second selectors and connectors; 1 F In the accompanying drawingsFiguresl and 2 represent a complete connection between ia' callingsubstation A, (Figi 1) anda A? r (Fig. 2)-' in a system embodying the -principles of my inventioni In 1' there isrepresented an'automatic controls the switches entirely independently substation A to the line conductors of which there is allotted at the central office anin dividual or'line' switch C. At D there is shown a master switch for controlling a group of line switches C. The line switches I of this group have common access to. a num berof trunk lines which lead tofirstselector switches E. A number of first selectors have commonaccessto a numb'erof second selectors- F, which'in turn have access toconnector. switches H (Fig. 2),-by meansof which connection subscribers lines a V 1 Fig. 3 is a front view of my improvedsub station coin-collectingdevice." 1

p may be completed with Fig. 4 is aside elevatlon of the apparatus I shown in Fig. 3. a a I Fig. 5' is a partial sectionalview of 'the coin chute taken on thefli'ne 5-5 o'f'Fig. 3; I will firstdescribetheconstruction-and method of operation of the "coin-collecting device. "'1 In Figs. 3 ands, 2 represents a face plate to the front surface of which is atta h d a coi chute Also upo he front of the plate 2, but insulated therefrom and from each other,"t'here is mounted a pair of contact springs 5 and -6 The lower end of the spring '5 carries a swinging;

forward above th arm 7. When the annealtnre "11 is attracted downward to. the left, the lower ,end of the arm 12 is brought hehind: the lug 13 on the arm .7. If, nblv the armature 11 be tippeddonnnrard to the right, the end of the arm 12 engages the small lug '13 and carries said {7 tozthe left. 'When the arms? is thusmoned itoathe left, itsleft end projects into'an opening 14in the side ofthe coin chute, h le. spring .5 is forced into engagement wit the sprin-gfle If a will be dropped down he ehute while the arm 7 is nkthis posi ion, the coin will s ike the end .efseid arm T, carryin the lug 131cm of engagemen wit the arm 12, wh reby the springs 15 and ,6

are permitted ho-separat he spring 15 serves to hold the arm 7 in engag ment with th ar 2nnti1the coin is depos ted Af er the '7 has been released it c nnot be drawn over un il the rel tro negnet h be n en gized in th reverse dire tio to bring the arm 12 behind the l g-1' again- Upon the f lolhtcof he coin ,chnte a d near the top thereof there is pivotally mprinted a. sma l fiat lever 16. The inn r nd 17 of this lever is a apted to ing thr ugh opening in the f-ron f the chute end f rm an obstruction therein to prevent ,a coinpassin-gldown- The end 18 of the le e s pr rided wit an opening hrough w c Pa se the end of ,a rod 18, thelonger .end .of which rod is secured to the armature 1 1. of th l ftroinagnet. The lever 16 1s thus controlled.

by ,th'e ,electnomagnet in s h e ma n r that he coin chin i bs neted eith r wh n the armatureof the magnet is in its neutral position or wh n i is entr s ed downward to the left.- When the armature ll is attracted down-Wendie the igh h e d 7 of the ever 16 passes entirely outside the ,coin chute,

l aving it unob t cted If oin i nleeed in the ,chnte wh i i ob tr ct d by the lever 16, the coin assumes the position shown by dotted lin F g. with P rtion thereof extendingahove the top of theohnte, where y it m y h gre pe an em ved if desired. v i Mou ted in ehe 10, 11 Wel i" t wi chine th re i a get 2. the lower en of which is forced aga nst -.t1. e beck wall o the .cln1.t.e by the/spring 22 \lVhen coin passes down the chute i f r es l he g te out passes on With but little obstruction.

If however a ire or an thin of a simi- J v 9 a "lar nature should be inserted in the chute for the'purposc of fraudulently operating the arm 7 the gate 22 acts as a clutch and sei zesthe Wire when an attempt is made to rw lthdraw 1t. 7

The automatic substations may be of any suitable o1 epproned type. Those with which I have chosen to illustrate my invention, and as illustrated at 1A, in Fig. 1 c mprise the usual recei er .25, swit h h ok .26., ransmitter :27, ringer 291 m o d n e 39 lh ed li onm he bs tion A s P rid ql nithsthe nnpulse sp i g 3 a d 2 end imnnlse wh el i impu s wheel carries noon i s pe phe y lth 'impulse teeth 34 and is secured to a shaft to, wh ch there is also l tt e ed d (n shone) nre ieled w h finger. l s thr g he ni s inn of whic el he mpul wh el he ee etecl es e imrn s s retu n d o he 1m re ienby spring (not shown) after it has been rotated fierez y igit, e eh ef th iee i 3e wh passes the d e the sp i g f c s sp ng" o t of engagem n it th er s The number ,ofti nes these springs i lie ere e ed d pen s hen the igi ce led Gonnee ed to th n of. the b t ion A he e is als show o e ofv my pr e coin-collecting deyices- The coinrcollecting qleyice is represented only diagrammatically .1 vand the parts ,are designated by he sam ref renc umerals es n gs? ende A The line switch C, which is indiyidual to the ie ref st t on A, end the ma t r switch D are modified forms of the general yp of lin witch end, w s er swi ch e esed in Brit sh p en 11 B,- e l No- 6 3 1 o 1906, being of the Particular type, however, shown in British patent to T; lllantin, No, l lli) of 1910 The selector E is of the general typeof selectors disclosed in United States Letters Patent No. 815,321, granted March 18, 1906, e K ith Er ck on and Eri k n, being modifi d, ewes lx as s wn n t e it h Patent h1g0 1,419 of 1 910, above referred to,

so to operate in atW O-wWl Y-B system, 6., e sy em wh h t e c nt o ice epn tus is controlled from the calling substation ev r the t id s of h i n se i The "selector F issinn ilar to the selector E, with the addition of the side switch wiper e As the spec fic structure of these line wit hes and first and second selectors terms pe t Of my P e en tio it i th -ism necess ry to d scr t ame me n tail, as th c ns ructi n an opere ien 9f th ame are W l kno n n th he -.eQ. in et r1- is of t e r l p of connector switch disclosed in United are similar to thesubstation A and the line lineswitch in the'usual and well-known States Letters Patent No. -81'5,176,granted March 13, 1906, to. Keith, Erickson and Erickson, but, like the selectors, is modifiedv in :order to operate in a two-wire system. Like the selectors, the connector is provided with a shaft (not shown) carrying the wipers 86, 87 and 88, and is controlled by the Vertical magnet 89 and the rotary magnet 90. The usual side switch is controlled by'the private magnet 91 in the usual manner. Theline relay 92 is connected with the line conductors through the springs of a reversing relay 93. -The connectoris provided with a so-called back-bridge relay 177 through which the calledsubstation isprovided with talking battery current, and with a ringer relay throughthe medium of which rmgmg current may be applied to the'called line after connection is completed therewith. The substation A and the lineswitch C switch C, respectively. 7 At M there is shown a ringing currentv generator andat L a busy signaling machine comprising acircuit in-I terrupter 93 and an induction coil 94?. For operating the central oflice apparatus and for furnishing talking current, there is provided a battery B, having one pole, preferably the positive, grounded at G. c

Having given a general description of the preparatory to making a call, the switch hook rises, permitting thespring 95 .to pass out of engagement with the spring, 97 and into contact with the spring 96, whereby the circuit of the ringer, .29 and the condenser 30 is broken and a bridge consisting of the substation transmitter, the receiver andthe windings of the coin-collecting device is closed across the line conductors 98 and 99. The closure of this bridge across the line completes an energizing circuit through the 7 line winding 46 of the switch 0. This circuit extends from ground G through the springs 101 and 102,1ine99, coils 9 and,;10

of the coin-collecting device, transmitter 27, receiver 25, impulse springs 31 and, 32, springs 96 andv95, line '98, spr1ngs'104c and 103. of the line switch 7C and the; winding 46 of the magnet 40 to the battery lead 100., The current through the coils of the coins collecting device at this time flows in such a direction as toattract the armature toward the coil 9, as shown in Fig. 1, thereby bringing the end of the arm 12 into engagement:

with the lug 13 onthe arm 7 The energization of the'winding 46 serves to operate the manner to select'an idle trunk extending to the first selector E. The calling subscriber now operates his calling; dial in the usual manner for the first digit2 ofthe desired number. As the impulse wheel 33 returns to normal, position after'being rotatedfor this digit, ,theimpulse springs 31'and .32 are separated twice. momentarily; Eachtime the springs 31- and 32. are se aarated 'theene-r 'izin circuit of the line relay 77 of the selector E is broken,

allowing said relay to be momentarilydeenergized; 77 operates to raise the switch wiper-s67, (38

and'69 to a position opposite the secoml These wipers are then rotated autelevel. matically to select the first idle trunk in this second level, which trunk leads to one of the secondselectors F.

subscriber now operates his calling device for the second digit 2 The second selector F operates in response to the impulses for this digit in'the same manneras the selector E, and extends connection to an idl'e'connector Hover the trunk lines 13% and 135.

V The calling subscriber now operates his dial forthe third digit 2, momentarilysepas This operation of theline relay,

Connection, isthus ex,- tended tothe second selector. The calling rating the impulse springs 31'and'32in the same manner as described forthe firstdigit. Each time the impulse springs are separated for the third digit, the energizing circuit for the connector line relay 92 is broken mo-' mentarily. This operation of the line relay operates the connectorin the well-known manner-to raise itup tolthe second level.

The connector isthen in position to receive 5 impulses for the last digit '0. -The operation of the substation calling device for-this digit breaks the energizing circuit of the relay 92 tentimes. The rotary magnet thenre ceives ten impulses and operates to rotate the wipers ten steps onto the contacts of the l1ne No. 2220. -Tlie private magnet relay 14:9is

V ener ized b I the first im ulse to the rotary magnet and again closes the circuit of the private magnet. 91. The circuit of the relay 1 19 isnot opened long enough to permit it to deenergize until after (the last impulse has beenidelivered to theo rotary magnet. The relay 149 thendeenergizes and breaks the circuit of the private magnet" 91 which, if the called line is not already busy, .inpturn 'dcenergizes, and permits theside switchto' pass to third position, whereby connection is completed betweenthe calling andgcalled lines. The sideswitch wiper156 (in third position) extends the guarding potential from ground G through the private wiper 87 to the connector privatebank contacts of the called line, and also provides an energizing circuit for-the cut-off winding 157-075 the line switch C. The winding 157, upon energizing, attracts the armature 158, which operates to disconnect the'line winding 1 5 9 1 and ground G from the called line,;and to extend the line conductor 160 through the springs 1'62 and 163 to the connector bank contact which is -engaged by the wiper 86. hen the side switch wiper 150 of the con nector reaches third position, the energizing circuit is established for the ringer relay 16 1. lhis circuit extends from ground G through the interrupter 1653, relay 1641, springs 171 and 170 and the side switch wiper 150 tothe'battery lead 100. Since this circuit includes the interrupter 165, the

relay 164i is energized only intermittently.

ing current fiowsext'ends from ground G to the side switch wiper 156, lower winding of the relay 177, ringer relay springs 188 and 189, side switch wiper 187, shaft wiper 88, line 161, coils 281 and 280 of the coin collecting device, transmitter 183, receiver 184, impulse springs 182, hook switch springs 185 and 186, line 160, springs 162 and 163, shaft wiper 86, ringer relay springs 181 and 180, private magnet springs 179 and 178,

upper winding of the back-bridge relay 177 and the side switch wiper 150 to the battery lead 100. The current through. the coils 281 and 280 of the coin-collecting device at the substation A is in such'direction at this time as to attract the armature, toward the coil 281; When the connector back-bridge relay 177 is energized by the talking current it operates to close the circuit through the relay 93. This circuit extends from ground G through the side switch wiper 156, relay 93 and springs 288 and 289 to the battery lead 100. The relay 93, upon energizing, operates to break the circuit of the ringer relay 16 1- at the springs 171 and 170, and to complete a locking circuit for itself through the springs 170 and 169 and the side switch wiper 150. This locking circuit is independent of the springs 288 and'289 of the back-bridge relay 17 7 Consequently, the relay 93 will not deenergize and elosethe circuit of the ringer relay 164: again in case the called subscriber should hang up his receiver and break the circuit of the backbridge relay 177 before the calling subscriber has hung up his receiver. When the relay 93 is energized it also operates to shift 1 ing line is reversed.

the trunk conductors 134 and 135 are interchanged. By this shifting of the connections of the relay 92 the current in the call- This reversal of the current causes the polarized relay of the coin-collecting device at the substation A to attract its armature in theopposite directio1 -that is, toward the coil 10.

Some time before completing the call, preferably before beginning to operate the calling device, the calling subscriber inserts a coin in the chute of the calling de vice; Thecoin is arrested by the lever 16 and remains in the position indicated by the dotted circle in Fig. 3 until the called subscriber answers. It has been explained that when the called subscriber answers, the

arinature 11 of the coin-collecting device is attracted over toward the coil 10. When the armature is thus attraoted,the arm 12 carries the arm 7 over so as to close the contact between the springs 53 and 6 and to cause the end-of said arm 7 to project. into the coin chute. At the same time the arm 18 moves the lever 16 so as to remove the obstruction from the coin and allow it to pass on down the chute. reaches thearm 7 it releases it from the arm '12 and permits the springsfi and 6 to separate. When the springs 5 and 6 are brought into contact, the transmitter and receiver at the substation are short-circuited and rendered inoperative. Thus it will be seen that unless the calling subscriber de: posits a coin to cause these springs to be.

answers, and said'coin will be held in reach-- nessto pass on down the chute andrestore the calling telephone to operative condition immediately upon the removal of the receiver at the calling substation. If no re spouse is received from the called line, the obstruction will, of course, not be removed from the coin, and the calling subscriber can simply remove it from the chute and is,

therefore, not required to pay for a call which is not answered. I

After the conversation is completed, the release of the central ,oflice apparatus is initiated by the hanging up of the receiver atthe callingsubstation. l/Vhen the receiver 25 is restored to the switch hook 26, the springs 95 and 96 are separated, thereby breaking the energizing circuit through the c'onnector line relay 92. The relay 92, upon deenergizing, breaks the holding circuits of the release relays 139, 128 and 82 of the switches H, F and E, respectively, whereby they are released in the well-known manner. The foregoingis an explanation of the mannerin which connection is obtained hen the coin with an idle line. Itwill, of course, be understood that there isa guarding ground potential on the connector private bank contacts of a busy line. Thus if the wipers of the connector H are rotated onto the con-' tacts of the busy line, a busy signal is transmitted back to the calling subscriber from the busy signaling machine L in a manner well understood in the; art. The switches are then released in this position by the hanging up of the receiver at the calling substation in practically the same manner as when an idle line is called. It'will be seen that when a busy line is called, the current in the calling line is not reversed. Therefore, the armature of thecoin-collecting device at the substation A is not attracted toward the coil 10 to close the springs 5' and 6, but remains in the position shown in Fig. 1 until at some subsequent time an idle line is called from the substation A and the callis'answered.

From the foregoing it will be seen that the calling subscribers telephone is rendered inoperative upon the response of the called subscriber, but that if a coin has been deposited, said telephone will be again im mediately rendered operative by said coin; Thus it is evident thatv no conversation can be carried on until after the calling subscriber has deposited a coin in the coin-collecting device. It will'also be seen, however, that means are provided whereby the coin may be deposited in the device any time before the called subscriber answers, but the coin remains in a position from which it may be readily recovered by the depositor. Upon the responseof the'called subscriber the coin is immediately allowed to pass on down the chute and'perform its function of rendering the calling telephone operative. Thus there is no delay between the time when the called subscriber answers and the time when thecalling subscriber. is able to talk, as there often is in cases where the calling subscriber does not deposit the coin until after. he is notified in some manner that the called subscriber has answered.

A further advantage of my improved system is as follows: In telephone systems giv ing so-called measured service it very often desired that no charge shall be levied for calling certain lines, such as lines which terminate at the central oflice overvwhich operators or exchange attendants are called, etc. In the system shown herein it is very easy to provide for free service when certain lines are called. This may be done by making the lines which are to be called free of charge accessible from special connector switches.

These special connectors maybe similar in all respects to the connector H, with the exception that the line relay .92 should be connected with the trunk conductors 134: and

135 direct instead of through the springs of a the relay 93. In these special connectors the relay corresponding to the relay 93 would have nosprings corresponding to the Y I springs 166, 167, 168, 172," 173 and 174;. Since the line relay of these connectors is permanently connected with the line conductors, the current in the calling line isnot reversed upon the removal of the receiverat the called substation which has been called through one of these special" connectors. Since thecurrentin the calling line is not reversed, the calling telephone is not made inoperative and consequently it isnotnecessary for thecalling subscriber to deposit a coin before he can talk. It is evident that if'the subscriber does deposit a coin before making-1a free call, the coin will not pass beyond the control of the calling subscriber and may be readily recovered.

WhatI claim as myinvention is:-

a calling and a called s'ubscribers line, means a 1 1. In a measured service telephone system,

including automatic trunk-selectingswitches I for extending a connection between said lines, means operated upon the response of the called subscriber for rendering the transmitter and receiver on the calling line inoperative, and means under thevcontrol of the calling subscriber for thereafter-rendering said transmitter and receiver operative.

2. In a. measured service telephone system, a calling and acalled subscribers line, means including automatictrunk-selecting switches for extending a connectionbetween said lines, means operated upon the response of the called subscriber for rendering the transmitter and receiver on the calling jline inoperative, and coin-controlled means un der the control of the calling subscriber for receiver operative.

3. In a measured service telephone sys tem, a calling and a called subscribers line, means including automatic trunk-selecting switches for extending a connection between saidlines, means operated upon the response of. the called subscriberfor short-circuiting the transmitter and receiver on the calling line to render the same inoperative, and means under the control of thecalling'subscriberfor thereafter breaking said shortcircuit to again render said transmitter and receiveroperative. f

4:. In a measured service telephone system, a'callingland a called subscribers line, means thereafter rendering said transmitter and including automatictrunk-selecting switches for extending a connection between said lines, means operated upon the response of the called subscriber for short-circuiting the transmitter and receiver on "the calling line to render the same inoperative, and' coincontroll ed means under the control of the calling: subscriber for thereafter breaking said short-circuit to again rendersaid tran's mitter and receiver o erative.-

In a measured service telephone system, a calling and a called subscribers line, means including automatic switches'for establishing a connection between said lines, a coin-collecting device and an impulsetransmitting device at the calling station, means for operating said impulse-transmit ting device independently of said coin-collecting. device for operating said switches, means for rendering the transmitter and receiver at the calling station inoperative upon the response of the called subscriber, and means controlled by said coin-collecting de vice for again rendering said transmitter and receiver operative.

6. In a measured service telephone sys& tem, a calling and a called subscribers'line, talking equipment for each of said lines, means for extending a'connection between said lines, a coin-collecting device on said calling line, amagnet for controlling the operation of said coin-collecting device, and means for reversing the current through said magnet upon the response of the called subscriber t-o collect the coin deposited in said device and to render said talking equipment inoperative for talking. v I

7. In a measured service telephone system, a calling and a called subseribers line, talking equipment for each of said'lines, means including automatic switches for extending a connection between said lines, a

coin-collecting device on the calling line, and

means operated upon the response of the called subscriber for reversing the'flow of current on the calling line to operate said coin-collecting device to collect a coin de, posited therein and to render said talking equipment inoperative for talking. 1 8. In; a measured service telephone system, a calling and a called subscribers line, means including automatic switches for extending the connection between said lines, means operatedupon theresponse of the called subscriber for reversing the current upon the calling subscribers line to render the transmitter and receiver thereon inoperative, and subscriber-controlled means for thereafter rendering said transmitter and re cciver again operative.

9.111 a measured service telephone system, a calling and a called subscribers line, means including automatic switches for extending the connection between said lines, means operated upon the response of the called subscriber for reversing the current upon thefcalling subscribers line to render the transmitter and receiver thereon inoperative, and coin-controlled means for therefter rendering said transmitter and receiver again operative.

, 10. In a 'meaured serv1ce telephone system, a calling and a called subscribers line, alk n eq ipme 0 ea o aid l nes means for ending a ce mq ivn b twe n sesame said lines, a coin collecting deviceaon the calling line including a coin chute, a stop normally preventing a coin from passing dQWnsaid chute, a magnet for controlling said stop and means for reversing the current through said magnet upon the response of the called subscriber to remove said stop to permit the coin to pass down said chute and be collected and to render said talking equipment inoperative for talking.

l LIn a measured servicetelephone sys tem, a calling and a called subscribers line, means .for establishing a connection between said lines, a coin-collecting device on said calling line including a coin chute, a stop normally preventing a coin from passing down said chute, an arm carrying. said stop, an electromagnet for Operating said arm, means operated upon the response of the called subscriber for reversing the current through said magnet to operate said arm to remove said stop and thus permit the coin to pass down said chute, means operated by saidarm for short-circuiting the transmitter and receiver on the calling line, and means operated by the coin passing down said chute forbrealring said short-circuit to again render said transmitter and receiver operative.

12.1na measured service telephonesyss tem, a callingand a call-ed subscribers line, means including automatic trunk-selecting switches for extending a connection between said lines,: an impulse transmitter for transmitting impulses over two sides of the calling line in series for controlling the opera-, tion of said switches, means operated upon the response of the called subscriber for renderingthe transmitter and receiver on the callingline inoperative, and means under the 'control of the calling subscriber for thereafter rendering said transmitter and receiver operative. l3. Ina measured service telephone system, a calling and a called subscribers line. means including automatic trunk-selecting switches for extendinga connection between said lines, animpulse transmitter for transmitting impulses over two sides of the calling linein series -forcontrolling the operation of said switches, means operated upon the response the called subscriber for rendering the transmitter and receiver on the calling line inoperative, and coin controlled means under the control of the calling subscriber for thereafter rendering said tran mitterand receiver operative.

l4. In a measured service telephone system, a calling and a called subscribers line, means including automatic trunk-selecting switches for extending a connection between said lines, an impulse transmitter for transmitting impulses over two sides of the calling line in series for controlling the operation of said switches, means operated upon the response of the called subscriber for short-circuiting the transmitter and receiver on the calling line to render the same inoperative, and means under the control of the calling subscriber for thereafter breaking said short-circuit to again render said transmitter and receiveroperative.

15. In a measured service telephone system, a calling and a called subscribers line, means including automatic trunk-selecting switches for extending a connection between said lines, an impulse transmitter for transmitting impulses over two sides of the calling line in series for controlling the operation of said switches, means operated upon the response of the called subscriber for short-circuiting the transmitter and receiver on the calling line to render the same inoperative, and coin controlled means under the control of the calling subscriber for thereafter breaking said short-circuit to again render said operative.

' 16. In a measured service telephone system, a calling'and a'called subscribers line, means including automatic switches for extending connection between said lines, an impulse transmitter for transmitting impulses over two sides of the calling line in series for controlling the operation of said switches, a coin-collecting device on the callingline, and means operated upon the response of the called subscriber for reversing the flow of current on the calling line to operate said coin-collecting device to collect a coin deposited therein.

17. In a measured service telephone system, a calling and a called subscribers line, means including automatic switches for extending the connection between said lines, an impulse transmitter for transmitting imtransmitter and receiver pulses over two sidesof the calling line in (iii series for controlling the operation of said switches, means operated upon the response of the called subscriber for reversing the current uponthe calling subscribers line to render the transmitter and receiver thereon inoperative, and subscriher-controlled means for thereafter rendering said transmitter and receiver again operative.

18. In a measured service telephone system a calling and a called subscribers line, means including automatic switches for extending the connection between said lines, an impulse transmitter for transmitting impulses over two sides of the calling line in series for controlling the operation of said switches, means operated upon the response of the called subscriber for reversing the current upon the calling subscribers line to render the transmitter and receiver thereon inoperative, and coin-controlled means for thereafter rendering said transmitter and receiver'again operative. V

1.9...In a measured servicetelephone system, a calling and 'a'calledsubscribers line, means including automatic switches for establishing a connection between said lines, a coincollecting transmitting device at the calling station, means for operating said impulSetransmitting device independently of said coin-collecting device for transmitting impulses over two sides of-the calling'line in series for operating-said switches, means for rendering the transmitter and receiver at the calling station inoperative upon the response of the called subscriber, and means controlled by said coin-collecting device for again rendering said transmitter and receiveroperative.

20. In a measured service telephone sys term, a calling and acalled subscribers line, means including automatic switches for establishing a. connection between said lines, a coin-collecting device and an impulsetransmitting device at the calling station,

means for operating saidimpulse-transmitting device independently ofsaid coin-col: lecting device for transmitting impulses over two sides of the calling linein series for operating said switches, means for partially inserting a coin insaid device prior to the response or" the called subscriber, and means for collecting said coin when the called subscriber responds. I p

:21. In. a measured service telephone system, a calling and a. called subscribers line, talking equipment for each of said lines, means including an automatic switch for extending a connection between said lines, a

coin-collecting device on said calling line,a

magnet for controlling the operation of said coin-collecting device, and means for revers ing. the current through said magnet upon the response of the called subscriber to collect the coin deposited in said device and to render said talking equipment inoperative for talking;

22. In a measured -service telephone system, a calling anda called subscribers line,

device. and an impulsetalking equipment for-each of said lines,

means for extending a connection between said lines, a coin-collecting device on the calling "line, and means operated upon the response ofthe called subscriber for reversing the'fi'ow of current on the callingline to operate said coin-collecting device to collect a coin deposited therein and to render said talking equipment inoperative for talking;

23. Inatelephone system, a calling and a called subscribers line, means for establishing a connection between said lines, a coin-' collecting device on the calling line, means for partially inserting a. coin in said device before the called subscriber answers, and means controlled by-the response of the called subscriber for-first rendering the tele phone of the calling subscriber inoperative andfor then renderingit again operative if ies the calling subscriber has partially inserted the coin in the coin-collecting device.

In a telephone system, a calling and a called subscribers line, means including an automatic switch for establishing a -con-. nection between said lines, a coin-collecting device on the calling line, means for partially inserting a coin in said device before the called subscriber answers, and means controlled by the response of the called subscriber for first rendering the telephone of the calling subscriber inoperative and for then rendering it again operative if the call ing subscriber has partially inserted the coin in the coin-collecting device.

25. In a measured service telephone system, a calling and called subscribers line, talking equipment for each of said lines, means for extending a connection between said lines, a coin-collecting device on the calling line operative in one direction by the operating current, and means operated upon the response of the called subscriber for reversing the flow of current on the calling line to, operate said device in the other direction to collect a coin deposited therein and to render said talking equipment inoperative for talking.

26. In a measured service telephone system, a calling and a called subscribers line, means including automatic switches for extending a connection between said lines, a coin-collecting device on the calling line operative in one direction by the operating current, means under the control of the called subscriber for operating said device in the other direction to render the transmitter and receiver of the calling line in operative, and means under the control of the calling subscriber for thereafter rendering said transmitter and receiver operative.

2?. In ,a telephone system, automatic progressively movable apparatus for extending a talking connection from a calling line to a called line, an impulse sender and talking equipment for the calling line, a central battery for operating and talking purposes, said automatic switches provided with means responsive to impulses from said battery and controlled by said impulse sender over the two sides of the talking circuit in series, and a toll device having a magnet responsive to the talking current to prevent the subscriber from making a call without charge by,

* changing the circuits of the talking equipment of said calling line to render the same inoperative for transmitting and receiving purposes.

28. In a measured service telephone sys tem, a calling and a called subscribers line,

talking equipment for each of said lines,

means for extending a connection between said lines, a coin collecting device on said calling line, a magnet for controlling the operation of said coin-collecting device, said magnet controlled by current in one direction, and meansfor reversing the current through said magnet upon the response of the called subscriber to collect thecoin deposited in said device, and to thereafter render said equipment operative for talking.

29. In a measured service telephone system, a calling and a called subscribersline, talking equipment for each of said lines, means including automatic switches for extending a connection between said lines, a coin-collecting device on the calling line, said device controlled by current in one direction, and means operated upon the response of the called subscriber for reversing the flow of current on the calling line to operate said coin-collecting device to collect a coin deposited therein, and to thereafter render said equipment operative for talking. 30. In a measured service telephone system, a calling and a called subscribers line, talking. equipment for each of said lines, means for extending a connection between said lines, a coin-collecting device on the calling line including a coin chute, a stop normally preventing a coin from passing down saidchute, a magnet for controlling said stop, said magnet controlled by current in one, direction and means for reversing the current through said magnet upon the response of the called subscriber to remove said stop to permit the coin to pass down said chute and be collected and to thereafter render said equipment operative for talking.

31. In a measured service telephone sys-. tem, a calling and a called subscribers line, talking equipment for each of said lines, means including an automatic switch for extending a connection between said lines, a coin collecting device on said calling line, a magnet for controlling. the operation of said coin-collecting device, said magnet controlled by current in one direction, and means for reversing the current through said magnet upon the response of the called subscriber to collect the coin deposited in said device and to thereafter render said equipment operative for talking.

32. In a measured service telephone system, a calling and a called subscribefls line, talking equipment for each of said lines, means for extending, a connection between said lines, a coin-collecting device on the calling line controlled by current in one direction, and'means operated upon the response of the called subscriber for reversing the flowof current on the calling line to op erate said coin-collecting device to collect a coin deposited therein and to thereafter render said equipment operative for talking.

33. Ina measured service telephone system, a calling and a called subscribers line,

talking equipment for. each of said lines,

means for extending a connection between the talking circuit in series by current in one direction to affect the talking equipment on the calling line, and means operatedupon the response of the called subscriber for re versing the flow ofcurrent on the calling line to operate said'coin-collecting device to collect a coin deposited therein and to restore said equipment.

42. In a measured term, a calling and a called subscribers line,

talking equipment for each of said lines, means for extending a connect1on betweenv said lines, a coin-collecting device on the calling line including a com chute, a stop normally preventing a coin from, passingv down said chute, a magnet for controlling sa d stop, sa1d magnet controlled over two sldes of the talklng c1rcu1t 1n serles by ourrent'fin one directionv to afiect'the talking. equipmenton the calling line, and meansiior reversing the currentthrough said magnet uponthe response of the called subscriber to remove said stop to permit the coin to pass down the chute and becolleot'ed and to restore said equipment. r

' 43. In a measuredservme telephone sys tern, a calling and a called subscribers line,

Y calling line, said magnet controlled over two talking equipment for each of. said lines,

means including an automatic switch for'extending a connection between sald lines, a

' coin-collecting device on said calling line, a

magnet for controlling the operation of said coin-collecting device, said magnet controlled over two sides of the talking circuit in series by current in one direction to aifect the talking equipment on the calling line,

and means for reversing the current through said magnet upon theresponse of thecalled subscriber to collect the coin deposited in said device and to restore said equipment. I t hIn a measured service telephone systein, a calling and :11 called subscribers line, talking equipment for each of said lines, means for'extending a --connection between said lines, a coincollecting device on the side'sof the talking circuit in series by current in one direction to at'fect the talking equipment on the 'calling line, and means operated upon the resp'onseof the called subscriber for reversing the flow of current on service telephone sys-- direction to collect-acoiu deposited therein.

and to restore said equipment.

46; In a measured service telephone system, a calling and a called subscribers line, means for extending a connection between said lines, a coin-collecting device on said calling line, a magnet for controlling the operation of said coin-collecting device, said magnet controlled by'current in one directionto hold the coin accessible tothe subscriber: whereby he may remove the same without actuating said magnet,and means for reversing the current through said magnet upon the response of the called subscriber to collect the coin deposited in said device.

p417; In ameasured s'ervice telephone system, a calling and a called subscribers line,

means including automatic switches for, ex

tending a connection between saidlines,a com-collecting devlce on the calling line,

said device controlled by current in one dl-I rectionto hold the'coin accessible tothe sub scriber whereby he may remove the same without actuating said magnet, and means operated upon the response of the called subscriber for reversing the flow of current on the calling line to operate said coin-collecting device to collect a coin deposited therein. 7 v

48. In a measured tem, a, calling and a called subscribers line, means for extending a connection between said lines, a coin-collecting device on the calling line including a coin chute, a stop normally preventing a coin from passing down said "chute, a magnet for controlling said stop, said magnet controlled by current in one direction to hold the coin for the subscriber, and means for reversing the current/through snamagna upon .there-, sponse of the. called subscr ber to remove said stop to permit the coin to pass down said chute and be collected.

6L9. In a measured servicetelephone sys-' tem, a calling and a called subscribers line, means including an automatic switch for extending a connectionbetween said lines, a coin-collectingdevice on said calling line, a magnet for controlling, the operation of said coin-collecting device, said'magnet controlled by current in one direction to holdthe coin for the subscriber, and means for reversing the current through said magnet upon the response of the called subscriber to collect the coin deposited in said device. 50. In a measured service telephone system, a calling and a called subscribers line, means for extending a connection between said lines, a coin-collecting device on the callingline, controlled by current in one direction to hold the coin for the subscriber, and means operated upon the response of the called subscriber for reversingthe flow of current on the calling lineto operate said service telephone sys coin-collecting device to collect a coin deposited therein.

51. In a measured. service telephone system, a calling and called subscribers line, means for extending a connection between said lines, a coin-collecting device on the calling line operativein one direction by the operating current to hold a coin deposited therein for the subscriber, and means oper- 1 ated upon the response of the called subscriber for reversing the flow of current on the calling line to operate said device in the other direction to collect said coin.

Signed by me at Chicago, Cook county, Illinois, this 16th day of November, 1911.

BERNARD D. WILLIS.

Witnesses ARTHUR J. RAY, E. D. FALEs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents. Washington, D. G. 

